Initial import.

This initial import have a basic routine to read messages from
the /dev/kmsg device.

Signed-off-by: Eduardo Silva <[email protected]>

Makefile

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+all:
+	$(MAKE) -C src/
+
+clean:
+	$(MAKE) -C src/ clean

README.md

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+# Fluent Bit
+
+__Fluent-Bit__ is a [Fluentd](http://fluentd.org) collection tool designed for Embedded Linux that collects Kernel messages (Kernel Ring Buffer) and Hardware metrics such as CPU and Memory usage.
+
+## Build
+
+The tool do not have any dependency besides the standard C library, to build it just type _make_:
+
+```bash
+$ make
+```

include/fluent-bit/in_kmsg.h

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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015 Treasure Data Inc.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#ifndef FLB_IN_KMSG
+#define FLB_IN_KMSG
+
+#define FLB_KMSG_DEV  "/dev/kmsg"
+
+int in_kmsg_start();
+
+#endif

src/Makefile

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+CC     = gcc
+CFLAGS = -g -Wall
+INCDIR = -I../include/
+SOURCE = in_kmsg.c fluent-bit.c
+
+all:
+	$(CC) $(CFLAGS) $(INCDIR) $(SOURCE) -o ../bin/fluent-bit
+
+clean:
+	rm -rf ../bin/fluent-bit *.o *~

src/fluent-bit.c

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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015 Treasure Data Inc.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include <fluent-bit/in_kmsg.h>
+
+int main(int argc, char **argv)
+{
+    in_kmsg_start();
+
+    return 0;
+}

src/in_kmsg.c

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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015 Treasure Data Inc.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <fluent-bit/in_kmsg.h>
+
+int in_kmsg_start()
+{
+    int fd;
+    int bytes;
+    char line[1024];
+
+    fd = open(FLB_KMSG_DEV, O_RDONLY);
+    if (fd == -1) {
+        perror("open");
+        exit(EXIT_FAILURE);
+    }
+
+    while (1) {
+        bytes = read(fd, line, sizeof(line) - 1);
+
+        if (bytes == -1) {
+            if (errno == -EPIPE) {
+                /* Message overwritten / circular buffer */
+                continue;
+            }
+            break;
+        }
+        else if (bytes > 0) {
+            line[bytes - 1] = '\0';
+            printf("%s\n", line);
+        }
+    }
+
+    return 0;
+}